Heat engine
US-2025215813-A1 · Jul 3, 2025 · US
the engines being of positive-displacement type
the engines being of positive-displacement type · Cooperative Patent Classification (CPC)
Engines, pumps, lighting, heating, and mechanical systems.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | F01K7/36 |
| Official title | the engines being of positive-displacement type |
| Display label | the engines being of positive-displacement type |
| Total patents | 26 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 4 |
| 2017 | 3 |
| 2018 | 2 |
| 2019 | 2 |
| 2020 | 2 |
| 2021 | 4 |
| 2022 | 1 |
| 2023 | 2 |
| 2024 | 3 |
| 2025 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Heat engine
US-12281601-B2 · Apr 22, 2025 · US
Heat engine
US-12276211-B2 · Apr 15, 2025 · US
Heat engine
US-2024200474-A1 · Jun 20, 2024 · US
System for recovering waste heat and method thereof
US-11988115-B2 · May 21, 2024 · US
Heat engine
US-11927117-B2 · Mar 12, 2024 · US
Expander system
US-11767784-B2 · Sep 26, 2023 · US
Heat engine
US-2023279787-A1 · Sep 7, 2023 · US
Expander system
US-2022213828-A1 · Jul 7, 2022 · US
System for recovering waste heat and method thereof
US-2021363900-A1 · Nov 25, 2021 · US
Flexible coal-fired power generation system and operation method thereof
US-10968784-B2 · Apr 6, 2021 · US
Flexible coal-fired power generation system and operation method thereof
US-2021033004-A1 · Feb 4, 2021 · US
Data center refrigeration system
US-10888024-B1 · Jan 5, 2021 · US
Thermal energy recovery device and operating method of the same
US-10605123-B2 · Mar 31, 2020 · US
Scissor type compression and expansion machine used in a thermal energy recuperation system
US-10598050-B2 · Mar 24, 2020 · US
Thermal energy recovery device
US-10508569-B2 · Dec 17, 2019 · US
Heat Engine
US-2019376418-A1 · Dec 12, 2019 · US
Thermal energy recovery device
US-2018223700-A1 · Aug 9, 2018 · US
Scissor type compression and expansion machine used in a thermal energy recuperation system
US-2018030858-A1 · Feb 1, 2018 · US
Thermal energy recovery device and operating method of the same
US-2017298780-A1 · Oct 19, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F01K7/36?
- CPC F01K7/36 is the Cooperative Patent Classification code for “the engines being of positive-displacement type.”
- How many patents are filed under CPC F01K7/36 (the engines being of positive-displacement type)?
- Our database includes 26 publications tagged with this CPC code.
- Is patent activity under CPC F01K7/36 growing?
- Publication counts under this code: 3 in 2024 vs 3 in 2025 (latest complete years).